Well, I don't know what to tell you. A bersa thunder leaves the web of my hand between thumb and pointer finger hurting pretty quick.
I've never shot the original Thunder 380, but I have the CC model and have no such problem. Maybe I don't have the world's most feeble hands, but I'm no toughie. I work in a lab handling only plastic tools that weigh about a quarter of a pound. The first day I had it, I shot 91 rounds and noticed no discomfort.
The CC has several differences from the original: slightly shorter barrel and slide, VERY small sights, holds one
more round in the magazine, and has a differently shaped frame, with finger grooves and more curvature in the backstrap. I suspect that last feature is the key. It nestles right into my palm, which I believe spreads the recoil out over the whole hand.
Despite the ludicrously small sights, in a well-lighted range, I was able to shoot it somewhat accurately. Attached are the first two targets I ever shot with it. The flyers are the fault of my trigger technique. More to the point (pun intended), I can point-shoot it and easily make COM hits on a silhouette target without paying much attention to the tiny sights.
I heartily recommend the little stinker. The MIM safety/decocker levers are known to break occasionally, but I don't consider that a deal-breaker since it should be carried hammer-down and safety OFF, relying on the DA pull as the real safety, so the lever is only needed after action, and they're supposed to be easy to replace.